Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db009e6e3ab2fb6…

MALICIOUS

PDF

77.8 KB Created: 2021-05-07 07:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 83626e6fccaaae432e02ffb22ffd4edc SHA-1: 55c9cabfc6bfcfcd313bade2179702cdbe30c52f SHA-256: 4db009e6e3ab2fb686d36e8b72884313ee3bd482da3e1118c22aeb42a7276a6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are hosted on dynamic DNS services or file-sharing platforms, suggesting a link farm or phishing operation. The heuristic PDF_SEO_LINK_FARM specifically indicates a mass of external PDF links, and the presence of a URL related to car repair costs in the document body suggests a lure to drive traffic to potentially malicious sites. While no scripts were explicitly extracted, the nature of the link farm and the ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/strik?utm_term=how+much+does+it+cost+to+fix+a+transmission+on+a+pt+cruiser PDF link annotation
    • https://tatamanigo.weebly.com/uploads/1/3/5/2/135299517/5814520.pdfIn PDF document text
    • https://gekaketiba.weebly.com/uploads/1/3/1/4/131455198/5424a33a6ab226.pdfIn PDF document text
    • https://losanuritajog.weebly.com/uploads/1/3/4/7/134730792/sijasazub-rilazugenipisa-mewirotiz-nubumefubu.pdfIn PDF document text
    • https://vimavopama.weebly.com/uploads/1/3/4/7/134769365/2239869.pdfIn PDF document text
    • https://wajodiladifaxuv.weebly.com/uploads/1/3/4/7/134768632/matibedugivoduwirig.pdfIn PDF document text
    • https://wojawodexof.weebly.com/uploads/1/3/4/6/134673733/tevepixamiwelix_depoxag_paboli.pdfIn PDF document text
    • https://xugojegisonixen.weebly.com/uploads/1/3/4/6/134684264/242591345.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://roxugotosaka.epizy.com/joguni.pdfIn PDF document text
    • https://s3.amazonaws.com/rizoli/35732904810.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/best_call_of_duty_game_xbox_one.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b11cfc8b-834e-407d-870b-f9f83741be61/epson_xp_800_ink_pad_reset.pdfIn PDF document text
    • http://fusizizugunu.epizy.com/adding_dissimilar_fractions_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06c2e50f-aec4-41fb-b7df-8a485f0d977e/power_electronics_daniel_w_hart.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/lurerimuvogolepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10470071-1417-419d-8c2e-33e4b3bb90c7/16257058177.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a69442f-3bb6-4f18-95a7-39a8513da3e9/sena_20s_evo_wont_pair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71eef8ff-23d2-4420-9858-48265f7f5fd7/vans_old_skool_platform_womens_sand.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/63330543261.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/16558287709.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36D 5368 bytes
SHA-256: b9beba15dfdbd720c269afd8ab4feec955ed6a3e47093d3f4c2a97888592218a
font_01_sfnt_off0000f594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF594 10860 bytes
SHA-256: d718f2c0fdd7dd5b5717bacce2ae6acb002d82199d29094b5ada674d4d21c061
font_02_sfnt_off00011ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e